I use to buy layer feed at the local farm store. Then I found out about a yr ago the my local mill sells it and they only have the mash, so i got some to try and mixed with the store feed and slowly changed them, they have had no problems on the mash and I feel better spending my money on the local farmers grain instead of who know where it came from. I also used to get my rabbit feed at the farm store and recently found the local mill also carries rabbit feed so I am now getting all my feed at the local mill. Wish they had starter feed for my chicks....
I have ran too low and had to buy a bag at the farm store a time or two and they seem to go through the feed store feed so much faster than the local mill feed so not only is it local, cheaper, and a larger bag. It last longer.
I don't have a problem with them being messy with the feed, whatever falls on the floor they clean up pretty well.
Hope that helps.